JP2560852B2 - Circuit breaker switching mechanism - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an opening / closing mechanism of a circuit breaker, and more specifically, an operating lever is operated by a handle to rotate a movable contact base via a link mechanism to turn it on. -Relating to the circuit breaker opening / closing mechanism that can be turned off.

[Conventional technology]

As a conventional circuit breaker having this type of opening / closing mechanism, one shown in FIG. 4 is known. here,
Reference numeral 1 is a handle capable of manually turning on / off the circuit breaker, 2 is engaged with the handle 1 via a pin 3, and is rotated around a support pin 4 by a counterclockwise operation of the handle 1. Lever 5, 5 is a first link member, 6 is a second link member, 7 is a movable contact base having a movable contact 8, 9 is a pin connecting the operating lever 2 and the first link member 5, and 10 is a first link member. 5 is a pin connecting the second link member 6 and 11 is a pin connecting the second link member 6 and the movable contact base 7.

In contrast to the above-mentioned opening / closing mechanism, 12 is fixed to a part of the yoke 13, an overcurrent detection unit that generates an electromagnetic force when an overcurrent occurs, and 14 is attracted by the overcurrent detection unit 12 and rotates. When the overcurrent flows into the circuit, the relative attitude of the first link member 5 and the second link member 6 that keeps the movable contact base 7 in the closed state as shown in the drawing causes the armature 14 to rotate. The movable contact 8 is pulled away from the fixed contact 15 by pulling the movable contact base 7 upward due to the movement.

Further, 16 is a supporting hole 17 whose both ends are supported by a part of the yoke 13.
And 17 is a movable contact point support pin that vertically supports the movable contact point 7 via springs and 18, and 17 is provided as a long hole for the wiping operation of the movable contact point 7, from the opening state to the closing process. This is a support hole for restricting the operation of the movable contact stand. Further, the opening / closing spring 18 is involved in opening / closing,
The spring 18 has a linear hook portion 18A that is locked in the locking recess 7A of the movable contact base 7 at the center thereof, and symmetrical twisted coil portions 18B are formed on both sides of this hook portion 18A. The ends of the coil portions 18B are locked to the cut-and-raised portions 13A that are a part of the yoke 13 (see FIG. 2).
Therefore, as shown in FIG. 5, in the closed state, a force in the P direction acts on the movable contact base 7 via the hook portion 18A of the spring 18, and the support pin 16 moves away from the bottom portion of the support hole 17 and the P The contact pressure between the movable contact 8 and the fixed contact 15 is obtained by the directional force.

[Problems to be Solved by the Invention]

However, in the above-mentioned opening / closing mechanism in the conventional circuit breaker, when the movable contact base 7 is rotated by the handle 1 via the operation lever 2 and the link mechanism, and the closed state shown in FIG. The hook part 18A
Although a force in the direction of arrow P acts on the movable contact base 7 via the, the play is provided in the locking recess 7A that locks the hook 18A. Then, the hook portion 18A is moved along the support recess 17A of the movable contact base 7 by the arrow Q along the locking recess 7A.
On the other hand, since the support pin 16 and the movable contact base 7 are configured to maintain contact with each other at the contact Z via the support hole 17 which is a long hole, the friction between them is large,
Due to both of these reasons, the positioning of the movable contact base 7 becomes unstable, and the contact pressure between the fixed contact 15 and the movable contact 8 is not stable.

The object of the present invention is to pay attention to the above-mentioned conventional problems, and in order to solve the problems, the movable contact base is surely positioned at the time of the closing operation by the handle to perform the contact operation with the fixed contact, and the stable operation is performed during that time. (EN) Provided is an opening / closing mechanism of a circuit breaker capable of obtaining the above contact pressure.

[Means for solving the problem]

In order to achieve such an object, the present invention has an opening / closing spring wound around a fixed support pin and involved in the opening / closing operation of the movable contact base, and a hook portion provided at the center of the opening / closing spring is provided in the movable contact base. The movable contact of the rotary contact base is biased toward the fixed contact via the hook by the spring force of the coil part symmetrically provided on both sides from the center part of the opening / closing spring by engaging with the locking part of Contact pressure at the time of movement, and the support pin is swayed along the support hole through the opening and closing spring by the support pin with the support pin penetrating the support hole of the long hole provided in the movable contact base. Do not support it freely,
In an opening / closing mechanism for a circuit breaker that can be opened / closed by a movable contact point by a handle, at least a coil portion of an opening / closing spring and a support pin around which the coil portion is wound are provided in a gap between a support hole of the movable contact point and a support pin. In addition to keeping the gap above the gap, the locking part of the movable contact block is formed so that the hook part does not move, and the spring force of the opening / closing spring transmitted to the movable contact block during the opening / closing operation by the handle supports the support hole. It is characterized in that it is not influenced by the contact between the support pin and the support pin.

[Action]

According to the present invention, the edge of the support hole provided in the movable contact base does not come into contact with the support pin during the process of closing and opening and in the closed state. It is possible to prevent the contact pressure between them from becoming unstable.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail and specifically with reference to the drawings.

1 and 2 show an embodiment of the present invention. In these figures, 70 is a movable contact base and 70A is a spring 18
Locking recess that locks the hook portion 18A of the movable contact base 7
It is a long hole provided at 0. Lever lever recess 7
As shown in FIG. 3, 0A is formed in a substantially inverted V shape, so that the hook portion 18A of the spring 18 moves in the locking recess 70A in the closed state and in the process thereof as shown in this figure. Instead, the operation of the movable contact base 70 is restricted in relation to the fitting clearance N between the coil portion 18B of the spring 18 and the support pin 16.

In addition, the support hole 71 is designed such that at least the gap N is maintained between the support pin 71 and the edge of the support hole 71 so that the support pin 16 does not come into contact with the support hole even in the closed state shown in FIG.

Therefore, in the opening / closing mechanism configured as described above, when the movable contact base 70 is closed as shown by rotating the handle 1 in the clockwise direction from the position of the handle 1 shown by the two-dot chain line in FIG. While the movable contact base 70 is supported by the support pin 16 via the hook portion 18A of the opening / closing spring 18, the movable contact base 70 rotates around the pin 11 via the link mechanism, and in the final process of the closing, the link portion 18B of the spring 18 is formed. The movable contact 8 can be kept pressed against the fixed contact 15 by the spring force of the. Moreover, in this process, since the support pin 16 does not come into contact with the edge of the support hole 71 of the movable contact base 70, friction does not occur between them and the support pin 16 and the opening / closing spring 18 move in relation to each other. The contact base 70 is positioned through the locking recess 70A, so that a stable contact pressure can be maintained between the movable contact 8 and the fixed contact 15.

〔The invention's effect〕

As described above, according to the present invention, in the closing operation, the coil portion of the open / close spring and the coil portion of the open / close spring are wound between the support hole provided in the movable contact base and the support pin penetrating the support hole. The gap between the support pin and the support pin that is held in the above state is maintained, and the hook part of the opening / closing spring is constrained by the locking recess of the movable contact block, and the spring force of the coil part is applied via the hook part. Since it is transmitted to the movable contact base, the movable contact base does not come into direct contact with the support pin in the closed process and the closed state, and a stable contact pressure can be maintained between the movable contact and the fixed contact. As a result, it is possible to reduce the load on the opening / closing spring, and it is possible to provide a circuit breaker having a light handle operating force.

[Brief description of drawings]

1 is a sectional view showing a closed state of a circuit breaker according to the present invention, FIG. 2 is a sectional view for supplementary explanation of FIG. 1,
FIG. 3 is a partially enlarged view for explaining a main part of the present invention shown in FIG. 1, FIG. 4 is a sectional view showing a closed state of a conventional circuit breaker, and FIG. 5 is shown in FIG. It is a partially expanded view of an opening / closing mechanism. 1 ... Handle, 2 ... Operation lever, 5, 6 ... Link member, 8 ... Moving contact, 13 ... Yoke, 15 ... Fixed contact,
16 …… Support pin, 18 …… Opening / closing spring, 18A …… Hook part, 1
8B: coil, 70: movable contact block, 70A: locking recess, 71: support hole.

Claims (1)

(57) [Claims] 1. An opening / closing spring wound around a fixed support pin for opening / closing the movable contact base, and a hook portion provided at the center of the opening / closing spring as a locking portion of the movable contact base. When engaged, the movable contact of the movable contact base is biased toward the fixed contact via the hook portion by the spring force of the coil portion provided symmetrically on both sides from the central portion of the opening / closing spring,
The movable contact base is configured to obtain a contact pressure when the circuit is closed, and the support pin is passed through the elongated support hole provided in the movable contact base through the opening / closing spring by the support pin. In the opening and closing mechanism of the circuit breaker, which is configured to be swingably supported along the support hole, and which can be opened and closed by the movable contact base by a handle,
The clearance between the support hole of the movable contact base and the support pin is maintained at least as large as the clearance between the coil portion of the opening / closing spring and the support pin around which the coil portion is wound, and the engagement of the movable contact base is maintained. The stop portion is formed so as not to move the hook portion, and the spring force of the opening / closing spring transmitted to the movable contact base during the opening / closing operation of the handle is influenced by the contact between the support hole and the support pin. An opening / closing mechanism for a circuit breaker, which is characterized by being prevented from being operated.